如何通过wasm_bindgen在Javascript中使用Vec<T>作为返回类型并使其可读

Question

我想编译以下代码。

use wasm_bindgen::prelude::*;

#[wasm_bindgen]
pub struct Dummy {}

#[wasm_bindgen]
pub fn test() -> Vec<Dummy> {
    vec![]
}

但是，编译器不允许我这样做。

error[E0277]: the trait bound `std::boxed::Box<[Dummy]>: wasm_bindgen::convert::traits::IntoWasmAbi` is not satisfied
  --> xxxx
   |
XX | #[wasm_bindgen]
   | ^^^^^^^^^^^^^^^ the trait `wasm_bindgen::convert::traits::IntoWasmAbi` is not implemented for `std::boxed::Box<[Dummy]>`
   |
   = help: the following implementations were found:
             <std::boxed::Box<[f32]> as wasm_bindgen::convert::traits::IntoWasmAbi>
             <std::boxed::Box<[f64]> as wasm_bindgen::convert::traits::IntoWasmAbi>
             <std::boxed::Box<[i16]> as wasm_bindgen::convert::traits::IntoWasmAbi>
             <std::boxed::Box<[i32]> as wasm_bindgen::convert::traits::IntoWasmAbi>
           and 9 others
   = note: required because of the requirements on the impl of `wasm_bindgen::convert::traits::IntoWasmAbi` for `std::vec::Vec<Dummy>`

我使用的是最新版本的wasm_bindgen (v0.2.55)。我认为这应该是可能的，对吧？

Answer 1

看起来还不太可能，还有一个相关的问题here。提到的一些解决方法包括通过Serde序列化/反序列化字节或JSON。但是转换成JS Array看起来像是Pauan添加的一个更好的变通方法。通过您的示例，看看这是否适用于您：

use js_sys::Array;
use wasm_bindgen::prelude::*;

#[wasm_bindgen]
pub struct Dummy {}

#[wasm_bindgen]
pub fn test() -> Array {
    let dummies: Vec<Dummy> = vec![];
    dummies.into_iter().map(JsValue::from).collect()
}